{"id":"CVE-2026-85271","published":"2026-09-18T21:18:44.630","lastModified":"2026-09-24T21:25:27.050","description":"Open edX Platform enables the authoring and delivery of online learning at any scale. From Redwood until Ulmo and Verawood.1, the add_additional_attributes_to_notifications function in openedx/core/djangoapps/notifications/email/utils.py assigns notification content without sanitizing discussion-title values produced by get_notification_content in openedx/core/djangoapps/notifications/base_notification.py. An enrolled student can place CSS-capable markup in the post_title value supplied by lms/djangoapps/discussion/rest_api/discussions_notifications.py. Digest and batched-email rendering then passes that value through openedx/core/djangoapps/notifications/templates/notifications/digest_content.html as safe HTML, allowing email-open tracking and content spoofing or phishing when another learner opens a CSS-rendering client. The immediate-email path is not affected because it strips title markup and renders a separately sanitized body. This issue is fixed in Ulmo and Verawood.1.","cvssScore":6.1,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","cwes":["CWE-79"],"vendors":[],"products":[],"references":[{"url":"https://github.com/openedx/openedx-platform/commit/2af03d21b4142e53e375c7f3699b313e92ec5121","tags":[]},{"url":"https://github.com/openedx/openedx-platform/commit/52f2b3bb3e6fac2601c29e8f926c81498d20bb0b","tags":[]},{"url":"https://github.com/openedx/openedx-platform/commit/5eae6e51a8797cd3b87cc132f5de73d52561c4d7","tags":[]},{"url":"https://github.com/openedx/openedx-platform/releases/tag/release/ulmo.4","tags":[]},{"url":"https://github.com/openedx/openedx-platform/releases/tag/release/verawood.1","tags":[]},{"url":"https://github.com/openedx/openedx-platform/security/advisories/GHSA-rv5w-f4r5-h77g","tags":[]}],"exploitRefs":[{"url":"https://github.com/openedx/openedx-platform/commit/2af03d21b4142e53e375c7f3699b313e92ec5121","tags":[]},{"url":"https://github.com/openedx/openedx-platform/commit/52f2b3bb3e6fac2601c29e8f926c81498d20bb0b","tags":[]},{"url":"https://github.com/openedx/openedx-platform/commit/5eae6e51a8797cd3b87cc132f5de73d52561c4d7","tags":[]},{"url":"https://github.com/openedx/openedx-platform/releases/tag/release/ulmo.4","tags":[]},{"url":"https://github.com/openedx/openedx-platform/releases/tag/release/verawood.1","tags":[]},{"url":"https://github.com/openedx/openedx-platform/security/advisories/GHSA-rv5w-f4r5-h77g","tags":[]}],"hasPoc":true,"ai":null}